diff --git a/src/Message/AbstractRequest.php b/src/Message/AbstractRequest.php
index 5a5b9e20..a9038ec8 100644
--- a/src/Message/AbstractRequest.php
+++ b/src/Message/AbstractRequest.php
@@ -37,6 +37,16 @@ public function setCardToken($value)
         return $this->setParameter('token', $value);
     }
 
+    public function getMetadata()
+    {
+        return $this->getParameter('metadata');
+    }
+
+    public function setMetadata($value)
+    {
+        return $this->setParameter('metadata', $value);
+    }
+
     abstract public function getEndpoint();
 
     public function getHttpMethod()
diff --git a/src/Message/AuthorizeRequest.php b/src/Message/AuthorizeRequest.php
index 21dc61e5..03154b19 100644
--- a/src/Message/AuthorizeRequest.php
+++ b/src/Message/AuthorizeRequest.php
@@ -15,6 +15,7 @@ public function getData()
         $data['amount'] = $this->getAmountInteger();
         $data['currency'] = strtolower($this->getCurrency());
         $data['description'] = $this->getDescription();
+        $data['metadata'] = $this->getMetadata();
         $data['capture'] = 'false';
 
         if ($this->getCardReference()) {
diff --git a/tests/Message/AbstractRequestTest.php b/tests/Message/AbstractRequestTest.php
index dae33b0e..d0315c20 100644
--- a/tests/Message/AbstractRequestTest.php
+++ b/tests/Message/AbstractRequestTest.php
@@ -19,4 +19,10 @@ public function testCardToken()
         $this->assertSame('abc123', $this->request->getCardToken());
         $this->assertSame('abc123', $this->request->getToken());
     }
+
+    public function testMetadata()
+    {
+        $this->assertSame($this->request, $this->request->setMetadata(array('foo' => 'bar')));
+        $this->assertSame(array('foo' => 'bar'), $this->request->getMetadata());
+    }
 }
diff --git a/tests/Message/AuthorizeRequestTest.php b/tests/Message/AuthorizeRequestTest.php
index 9c65b994..1dfe7c0c 100644
--- a/tests/Message/AuthorizeRequestTest.php
+++ b/tests/Message/AuthorizeRequestTest.php
@@ -14,14 +14,23 @@ public function setUp()
                 'amount' => '12.00',
                 'currency' => 'USD',
                 'card' => $this->getValidCard(),
+                'description' => 'Order #42',
+                'metadata' => array(
+                    'foo' => 'bar',
+                ),
             )
         );
     }
 
-    public function testCaptureIsFalse()
+    public function testGetData()
     {
         $data = $this->request->getData();
+
+        $this->assertSame(1200, $data['amount']);
+        $this->assertSame('usd', $data['currency']);
+        $this->assertSame('Order #42', $data['description']);
         $this->assertSame('false', $data['capture']);
+        $this->assertSame(array('foo' => 'bar'), $data['metadata']);
     }
 
     /**